Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh41a21m&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH41A-21
Other
7509 Corona, 7524 Magnetic Fields
Scientific paper
Alfven wave absorption as a mechanism for heating the coronal plasma has been extensively studied. The idea is especially promising when these waves propagate in an inhomogeneous medium, such as the solar atmosphere. Nonlinear mechanisms such as phase mixing (Heyvearts and Priest 1983) lead to enhanced dissipation due to the development of a strong magnetic-field gradient. Even the linear eigenmode analysis (Mok and Einaudi 1985) shows enhanced damping, although the underlying physical mechanism is not fully understood, partly due to the nature of the normal-mode analysis. In this study, we take a different approach by solving an initial-value problem, i.e. by launching a well-defined, forward propagating shear Alfven mode into a magnetic structure. We study the time evolution of the wave train and the nonlinear development due to phase mixing and other mechanisms. The re-distribution of the wave energy, its coupling into other modes, and its dissipation will be presented. Heyvaerts and Priest, 1983, Astron. and Astrophys. 117, 220. Mok and Einaudi, 1985, J. Plasma Phys. 33, 199. Work supported by National Science Foundation.
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